ALSA: sscape: Cache per-card resources for board reinitialization

The SoundScape driver programs the gate-array directly from the global
resource arrays during probe. That is sufficient for initial bring-up,
but a PM resume path also needs the resolved per-card IRQ, DMA, MPU IRQ
and joystick settings after probe has finished.

Store the resolved resources in struct soundscape and move the board
setup into a reusable helper. Also factor the MIDI state programming so
the same sequence can be reused by a later PM resume path.

This is preparatory work for suspend/resume support and is not intended
to change runtime behaviour.

Signed-off-by: Cássio Gabriel <cassiogabrielcontato@gmail.com>
Link: https://patch.msgid.link/20260411-alsa-sscape-pm-v2-1-aeb5682e14b0@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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